//
//  MSWebViewController.m
//  PeopleForTheFirstMall
//
//  Created by mac on 2021/6/15.
//  Copyright © 2021 MS. All rights reserved.
//

#import "MSWebViewController.h"
#import <WebKit/WebKit.h>

// WKWebView 内存不释放的问题解决
@interface MSScriptMessageHandler : NSObject
<
WKScriptMessageHandler
>

/**WKScriptMessageHandler 这个协议类专门用来处理JavaScript调用原生OC的方法 */
@property (nonatomic, weak) id<WKScriptMessageHandler> scriptDelegate;

- (instancetype)initWithDelegate:(id<WKScriptMessageHandler>)scriptDelegate;

@end

@implementation MSScriptMessageHandler

- (instancetype)initWithDelegate:(id<WKScriptMessageHandler>)scriptDelegate {
    self = [super init];
    if (self) {
        _scriptDelegate = scriptDelegate;
    }
    return self;
}

#pragma mark - WKScriptMessageHandler
//遵循WKScriptMessageHandler协议，必须实现如下方法，然后把方法向外传递
//通过接收JS传出消息的name进行捕捉的回调方法
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
    
    if ([self.scriptDelegate respondsToSelector:@selector(userContentController:didReceiveScriptMessage:)])
    {
        [self.scriptDelegate userContentController:userContentController didReceiveScriptMessage:message];
    }
}

@end

@interface MSWebViewController ()
<
WKScriptMessageHandler,
WKUIDelegate,
WKNavigationDelegate
>

@property (nonatomic, strong) UIButton          *closeBtn;          ///< 关闭按钮
@property (nonatomic, strong) WKWebView         *webView;
@property (nonatomic, strong) UIProgressView    *progressView;  ///< 网页加载进度视图

@end

@implementation MSWebViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    if (self.hideNavigation)
    {
        self.navBar.hidden = YES;
        self.progressView.frame = CGRectMake(0, 0, MS_SCREEN_WIDTH, 1);
        self.webView.frame = CGRectMake(0, MS_STATUS_BAR_HEIGHT, MS_SCREEN_WIDTH, MS_SCREEN_HEIGHT - MS_STATUS_BAR_HEIGHT - MS_SAFE_AREA_BOTTOM_HEIGHT);
    }
    else
    {
        // 关闭
        [self.navBar addSubview:self.closeBtn];
        self.progressView.frame = CGRectMake(0, MS_NAV_BAR_HEIGHT, MS_SCREEN_WIDTH, 1);
        self.webView.frame = CGRectMake(0, MS_NAV_BAR_HEIGHT, MS_SCREEN_WIDTH, MS_SCREEN_HEIGHT - MS_STATUS_BAR_HEIGHT - MS_SAFE_AREA_BOTTOM_HEIGHT);
    }
    
    [self ms_addSubViews];
    
    //添加监测网页加载进度的观察者
    [self.webView addObserver:self
                   forKeyPath:NSStringFromSelector(@selector(estimatedProgress))
                      options:0
                      context:nil];
    [self.webView addObserver:self
                   forKeyPath:@"title"
                      options:NSKeyValueObservingOptionNew
                      context:nil];
    
    [self loadLocalURL];
    [self loadNetworkURL];
}


#pragma mark - event
/** 返回 */
- (void)popLastPage
{
    if ([self.webView canGoBack])
    {
        [self.webView goBack];
    }
    else
    {
        [self closeWebView];
    }
}
/** 关闭 */
- (void)closeWebView
{
    [self.navigationController popViewControllerAnimated:YES];
}


#pragma mark - WKScriptMessageHandler
// 被自定义的WKScriptMessageHandler在回调方法里通过代理回调回来，绕了一圈就是为了解决内存不释放的问题
// 通过接收JS传出消息的name进行捕捉的回调方法
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
    MSLog(@"name:%@\\\\n body:%@\\\\n frameInfo:%@\\\\n",message.name,message.body,message.frameInfo);
}


#pragma mark - WKNavigationDelegate 主要处理一些跳转、加载处理操作，WKUIDelegate主要处理JS脚本，确认框，警告框等
// 页面开始加载时调用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
}

// 页面加载失败时调用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error {
    [self.progressView setProgress:0.0f animated:NO];
}

// 当内容开始返回时调用
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
    
}

// 页面加载完成之后调用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
    [self getCookie];
}

//提交发生错误时调用
- (void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error {
    [self.progressView setProgress:0.0f animated:NO];
}

// 接收到服务器跳转请求即服务重定向时之后调用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation {
    
}

// 根据WebView对于即将跳转的HTTP请求头信息和相关信息来决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    
    NSString *urlStr = navigationAction.request.URL.absoluteString;
    MSLog(@"发送跳转请求：%@",urlStr);
    decisionHandler(WKNavigationActionPolicyAllow);
}

// 根据客户端受到的服务器响应头以及response相关信息来决定是否可以跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{
    NSString * urlStr = navigationResponse.response.URL.absoluteString;
    MSLog(@"当前跳转地址：%@",urlStr);
    //允许跳转
    decisionHandler(WKNavigationResponsePolicyAllow);
    //不允许跳转
    //decisionHandler(WKNavigationResponsePolicyCancel);
}

// 需要响应身份验证时调用 同样在block中需要传入用户身份凭证
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * _Nullable credential))completionHandler{
    
    //用户身份信息
    NSURLCredential *newCred = [[NSURLCredential alloc] initWithUser:@"user" password:@"password" persistence:NSURLCredentialPersistenceNone];
    //为 challenge 的发送方提供 credential
    [challenge.sender useCredential:newCred forAuthenticationChallenge:challenge];
    completionHandler(NSURLSessionAuthChallengeUseCredential,newCred);
}

//进程被终止时调用
- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView{
    
}

#pragma mark - WKUIDelegate

/**
 *  web界面中有弹出警告框时调用
 *
 *  @param webView           实现该代理的webview
 *  @param message           警告框中的内容
 *  @param completionHandler 警告框消失调用
 */
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
    [self showAlert:@""
            message:message
   messageAlignment:NSTextAlignmentCenter
             action:[UIAlertAction actionWithTitle:@"OK"
                                             style:UIAlertActionStyleDefault
                                           handler:^(UIAlertAction * _Nonnull action) {
        
        completionHandler();
    }]];
}
// 确认框
//JavaScript调用confirm方法后回调的方法 confirm是js中的确定框，需要在block中把用户选择的情况传递进去
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler{
    [self showAlert:@""
            message:message
   messageAlignment:NSTextAlignmentCenter
         leftAction:[UIAlertAction actionWithTitle:@"Cancel"
                                             style:UIAlertActionStyleCancel
                                           handler:^(UIAlertAction * _Nonnull action) {
        
        completionHandler(NO);
    }]
        rightAction:[UIAlertAction actionWithTitle:@"OK"
                                             style:UIAlertActionStyleDefault
                                           handler:^(UIAlertAction * _Nonnull action) {
        
        completionHandler(YES);
    }]];
}
// 输入框
//JavaScript调用prompt方法后回调的方法 prompt是js中的输入框 需要在block中把用户输入的信息传入
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * _Nullable))completionHandler
{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:prompt
                                                                             message:@""
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        
        textField.text = defaultText;
    }];
    UIAlertAction *action = [UIAlertAction actionWithTitle:@"OK"
                                                     style:UIAlertActionStyleDefault
                                                   handler:^(UIAlertAction * _Nonnull action) {
        
        completionHandler(alertController.textFields[0].text?:@"");
    }];
    
    [alertController ms_makeChains:^(MSChainMaker * _Nonnull make) {
        
        make.ms_titleFontAndColor([UIFont systemFontOfSize:15], MS_HEX_COLOR(0x333333));
    }];
    
    [action ms_makeChains:^(MSChainMaker * _Nonnull make) {
        
        make.ms_titleTextColor(MS_HEX_COLOR(0xff8400))
        .ms_addToAlert(alertController);
    }];
    
    [self presentViewController:alertController animated:YES completion:nil];
}
// 页面是弹出窗口 _blank 处理
- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures
{
    if (!navigationAction.targetFrame.isMainFrame)
    {
        [webView loadRequest:navigationAction.request];
    }
    return nil;
}


#pragma mark - KVO
//kvo 监听进度 必须实现此方法
-(void)observeValueForKeyPath:(NSString *)keyPath
                     ofObject:(id)object
                       change:(NSDictionary<NSKeyValueChangeKey,id> *)change
                      context:(void *)context
{
    if ([keyPath isEqualToString:NSStringFromSelector(@selector(estimatedProgress))]
        && object == _webView)
    {
        MSLog(@"网页加载进度 = %f",_webView.estimatedProgress);
        self.progressView.progress = _webView.estimatedProgress;
        if (_webView.estimatedProgress >= 1.0f) {
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.3 *NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                self.progressView.progress = 0;
            });
        }
    }
    else if([keyPath isEqualToString:@"title"]
             && object == _webView)
    {
        self.navBar.titleLabel.text = _webView.title;
    }
    else
    {
        [super observeValueForKeyPath:keyPath
                             ofObject:object
                               change:change
                              context:context];
    }
}


#pragma mark - private method
/** 加载本地html */
- (void)loadLocalURL
{
    if (ms_stringIsEmpty(self.ms_localPath)) return;
    NSString *htmlString = [[NSString alloc] initWithContentsOfFile:self.ms_localPath encoding:NSUTF8StringEncoding error:nil];
    //加载本地html文件
    if (htmlString)
    {
        [_webView loadHTMLString:htmlString  baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]];
    }
    else
    {
        [_webView loadHTMLString:self.ms_localPath baseURL:nil];
    }
}
/** 加载外网html */
- (void)loadNetworkURL
{
    if (ms_stringIsEmpty(self.MSURL)) return;
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:MSURL(self.MSURL)];
    [request addValue:[self readCurrentCookieWithDomain:API_BASE_URL_STRING] forHTTPHeaderField:@"Cookie"];
    [_webView loadRequest:request];
}
/** 解决第一次进入的cookie丢失问题 */
- (NSString *)readCurrentCookieWithDomain:(NSString *)domainStr{
    NSHTTPCookieStorage*cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    NSMutableString * cookieString = [[NSMutableString alloc]init];
    for (NSHTTPCookie*cookie in [cookieJar cookies]) {
        [cookieString appendFormat:@"%@=%@;",cookie.name,cookie.value];
    }
    
    //删除最后一个“;”
    if ([cookieString hasSuffix:@";"]) {
        [cookieString deleteCharactersInRange:NSMakeRange(cookieString.length - 1, 1)];
    }
    
    return cookieString;
}
/** 解决 页面内跳转（a标签等）还是取不到cookie的问题 */
- (void)getCookie
{
    //取出cookie
    NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    //js函数
    NSString *JSFuncString =
    @"function setCookie(name,value,expires)\
    {\
    var oDate=new Date();\
    oDate.setDate(oDate.getDate()+expires);\
    document.cookie=name+'='+value+';expires='+oDate+';path=/'\
    }\
    function getCookie(name)\
    {\
    var arr = document.cookie.match(new RegExp('(^| )'+name+'=([^;]*)(;|$)'));\
    if(arr != null) return unescape(arr[2]); return null;\
    }\
    function delCookie(name)\
    {\
    var exp = new Date();\
    exp.setTime(exp.getTime() - 1);\
    var cval=getCookie(name);\
    if(cval!=null) document.cookie= name + '='+cval+';expires='+exp.toGMTString();\
    }";
    
    //拼凑js字符串
    NSMutableString *JSCookieString = JSFuncString.mutableCopy;
    for (NSHTTPCookie *cookie in cookieStorage.cookies) {
        NSString *excuteJSString = [NSString stringWithFormat:@"setCookie('%@', '%@', 1);", cookie.name, cookie.value];
        [JSCookieString appendString:excuteJSString];
    }
    //执行js
    [_webView evaluateJavaScript:JSCookieString completionHandler:nil];
    
}

- (void)ms_addSubViews
{
    [self.view addSubview:self.webView];
    [self.view addSubview:self.progressView];
}


#pragma mark - lazy loading

- (UIButton *)closeBtn
{
    if (!_closeBtn)
    {
        _closeBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        _closeBtn.frame = CGRectMake(MS_SCREEN_WIDTH - 37, MS_NAV_BAR_HEIGHT - 37, 30, 30);
        [_closeBtn setImage:[UIImage imageNamed:@"login_registered_close"]
                   forState:UIControlStateNormal];
        [_closeBtn addTarget:self
                      action:@selector(closeWebView)
            forControlEvents:UIControlEventTouchUpInside];
    }
    
    return _closeBtn;
}

- (UIProgressView *)progressView
{
    if (!_progressView)
    {
        _progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, MS_NAV_BAR_HEIGHT, MS_SCREEN_WIDTH, 1)];
        _progressView.tintColor = MS_HEX_COLOR(0x666666);
        _progressView.trackTintColor = [UIColor clearColor];
    }
    
    return _progressView;
}
- (WKWebView *)webView
{
    if(!_webView)
    {
        //创建网页配置对象
        WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
        
        // 创建设置对象
        WKPreferences *preference = [[WKPreferences alloc]init];
        //最小字体大小 当将javaScriptEnabled属性设置为NO时，可以看到明显的效果
        preference.minimumFontSize = 0;
        //设置是否支持javaScript 默认是支持的
        preference.javaScriptEnabled = YES;
        // 在iOS上默认为NO，表示是否允许不经过用户交互由javaScript自动打开窗口
        preference.javaScriptCanOpenWindowsAutomatically = YES;
        config.preferences = preference;
        
        // 是使用h5的视频播放器在线播放, 还是使用原生播放器全屏播放
        config.allowsInlineMediaPlayback = YES;
        //设置视频是否需要用户手动播放  设置为NO则会允许自动播放
//        config.requiresUserActionForMediaPlayback = YES;
        //设置是否允许画中画技术 在特定设备上有效
        config.allowsPictureInPictureMediaPlayback = YES;
        //设置请求的User-Agent信息中应用程序名称 MS_IOS9_AND_LATER后可用
        config.applicationNameForUserAgent = @"ChinaDailyForiPad";
        
        //这个类主要用来做native与JavaScript的交互管理
        WKUserContentController *wkUController = [[WKUserContentController alloc] init];
        /*
        //自定义的WKScriptMessageHandler 是为了解决内存不释放的问题
        MSScriptMessageHandler *weakScriptMessageDelegate = [[MSScriptMessageHandler alloc] initWithDelegate:self];
        //注册一个name为jsToOcNoPrams的js方法 设置处理接收JS方法的对象
        [wkUController addScriptMessageHandler:weakScriptMessageDelegate  name:@"jsToOc"];
         */
        
        config.userContentController = wkUController;
        
        //以下代码适配文本大小
        NSString *jSString = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";
        //用于进行JavaScript注入
        WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:jSString injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
        [config.userContentController addUserScript:wkUScript];
        
        _webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, MS_SCREEN_WIDTH, MS_SCREEN_HEIGHT) configuration:config];
        // UI代理
        _webView.UIDelegate = self;
        // 导航代理
        _webView.navigationDelegate = self;
        // 是否允许手势左滑返回上一级, 类似导航控制的左滑返回
        _webView.allowsBackForwardNavigationGestures = YES;
        //可返回的页面列表, 存储已打开过的网页
        WKBackForwardList *backForwardList = [_webView backForwardList];
        MSLog(@"可返回的页面列表 = %@", backForwardList);
//        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.chinadaily.com.cn"]];
//        [request addValue:[self readCurrentCookieWithDomain:@"http://www.chinadaily.com.cn"] forHTTPHeaderField:@"Cookie"];
//        [_webView loadRequest:request];
    }
    return _webView;
}


- (void)dealloc{
    //移除注册的js方法
//    [[_webView configuration].userContentController removeScriptMessageHandlerForName:@"jsToOc"];
    //移除观察者
    [_webView removeObserver:self
                  forKeyPath:NSStringFromSelector(@selector(estimatedProgress))];
    [_webView removeObserver:self
                  forKeyPath:NSStringFromSelector(@selector(title))];
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end
